B♭ (musical note)
B♭ (B-flat; also called si bémol) is the eleventh step of the Western chromatic scale (starting from C). It lies a diatonic semitone above Aand a chromatic semitone below B, thus being enharmonic to A♯, even though in some musical tunings, B♭ will have a different sounding pitch than A♯. B-flat is also enharmonic to C 
When calculated in equal temperament with a reference of Aabove middle C as 440 Hz, the frequency of the B♭ above middle C is approximately 466.164 Hz. See pitch (music) for a discussion of historical variations in frequency.
While orchestras tune to an A provided by the oboist, wind ensembles usually tune to a B-flat provided by a tuba, horn, or clarinet.
In Germany, Russia, Poland and Scandinavia, this pitch is designated B, with 'H' used to designate the B-natural. Since the 1990s, B-flat is often denoted Bb or "Bess" instead of B in Swedish music textbooks. Natural B is called B by Swedish jazz and pop musicians, but still denoted H in classical music. See B (musical note) for an explanation.
Designation by octave
Scales
Common scales beginning on B♭
- B-flat major: B♭ C D E♭ F G A B♭
- B-flat natural minor: B♭ C D♭E♭ F G♭ A♭ B♭
- B-flat harmonic minor: B♭ C D♭ E♭ F G♭ A B♭
- B-flat melodic minor ascending: B♭ C D♭ E♭ F G A B♭
- B-flat melodic minor descending: B♭ A♭ G♭ F E♭ D♭ C B♭
Jazz melodic minor
- B♭ ascending melodic minor: B♭ C D♭ E♭ F G A B♭
- B♭ Dorian ♭2: B♭ C♭ D♭E♭ F G A♭ B♭
- B♭ Lydian augmented: B♭ C D E F♯ G A B♭
- B♭ Lydian dominant: B♭ C D E F G A♭ B♭
- B♭ Mixolydian ♭6: B♭ C D E♭ F G♭ A♭ B♭
- B♭ Locrian ♮2: B♭ C D♭ E♭F♭ G♭ A♭ B♭
- B♭ altered: B♭ C♭ D♭ E
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